I had this problem once, which was caused by a non microsoft applet that had added its own entry. Since this was optional, I unchecked the "add icon to control panel" option in the preferences for the product (Creative Element Power Tools) and it fixed the problem. It was hard to diagnose the problem, it involved disabling the applets one at a time to find which was causing the problem, I got help from a forum on how to do it, but do not now remember which one.